The students can ask their teachers help Internet or telephone.

A. for, by B. with, on C. with, by D. for, in

A 【解析】句意:學(xué)生可以通過(guò)互聯(lián)網(wǎng)或電話向老師求助。考查介詞辨析題。ask for help請(qǐng)求幫助,固定短語(yǔ),可排除BC選項(xiàng)。by通過(guò),表方式,可排除in。根據(jù)句意語(yǔ)境,可知選A。
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